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  • 3 answers

Kalindi Yadav 8 years, 1 month ago

τ=1/λ =1•44 T1/2 Hence,T1/2=0•693 τ Here,τ is mean life and T1/2 is half life and λ is decay constant.

Kalindi Yadav 8 years, 1 month ago

Mean Life/Average Life- Average life of a radioactive element can be obtained by calculating the total life time of all the atoms of the radioactive element and dividing it by the total number of atoms present initially in the sample of the element.

Aviral Tandon 8 years, 1 month ago

abbe book me dia hai pdho na usse..yaha kya kaarre
  • 1 answers

Shivi Rajput 8 years, 1 month ago

Bcoz a large increase in their energy increases their velocity to very large extent. This throws the electrons out of steps with oscillating field.
  • 1 answers

.Ismat .Jamil 8 years, 1 month ago

1.Couldn't explain origin of spectral line in form of series as in case of H atom. 2.couldn't account for scattering of alpha particles through large angles as in Rutherford experiment
  • 1 answers

.Ismat .Jamil 8 years, 1 month ago

Answer resistance. 20 *10^3. Tolerance 10%. According to bbroygbvgw. Black,brown,red,orange,yellow, green, blue, violet,grey,white... Represents no. 0,1,2,3,4,5,6,7,8,9.respectively. First two give numerical value,III band give power & IV band tolerance as gold(5%) ,silver (10%) & others (20%). .... red 2,black 0 ,orange 3,silver 10%
  • 1 answers

Abhishek Soni 8 years, 1 month ago

Sound wave require medium particle to propagate, But for propagation of emw no material medium required
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

(2) Inside the pipe magnetic field is zero.(2) Outside the pipe magnetic field is B=μ0i/2πr where r is the distance from the axis.
  • 1 answers

Sudarson Sengupta 8 years, 1 month ago

Preventing it from eddy current loss
  • 1 answers

Hina Siddiqui 8 years, 1 month ago

Chances h xam mein aane ke
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

First law:In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force. Second law: In an inertial reference frame, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. (It is assumed here that the mass m is constant). Third law:When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.
  • 1 answers

Drishtee Gupta 8 years, 1 month ago

A continuous locus of all such particle of the medium which are vibrating in the same phase at any instant
  • 1 answers

Ishu Chouhan 8 years, 1 month ago

Solve sample papers and ncert questions along with 10 years question papers
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

The induction of an electromotive force by the motion of a conductor across a magnetic field or by a change in magnetic flux in a magnetic field.
  • 3 answers

Jin Kazama 8 years, 1 month ago

Ya fir dono attach hai

Jin Kazama 8 years, 1 month ago

Dono lens ke in b/w bhi koi duri hogi vo nhi likhi kya

Jin Kazama 8 years, 1 month ago

Lens formula ka use ker , Jo image convex bnayega vo concave ke liye virtual object ka kam karegi
  • 1 answers

Jin Kazama 8 years, 1 month ago

Must hai
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

042
  • 3 answers

Jin Kazama 8 years, 1 month ago

Nice work ha

Kalindi Yadav 8 years, 1 month ago

For large TV coverage, the transmission of TV signal is done from a tall antenna. Consider a TV antenna OP of height h. The transmitting signals cannot be received beyond points R1 and R2. This is due to curvature of earth. Clearly, OR1 and OR2 are the maximum distances, from the antenna, upto which the transmission signal can be received. Let OR1 = OR2 = d [d is half the total range] The relation between height h of the TV antenna and the maximum distance d upto which the TV signal can be received can be derived on the basis of geometrical considerations. From right – angled triangle CR2P, CP2 = CR22 + PR22 …. (1) In right – angled triangle POR2, PR22 = h2 + d2 [Note that ∠POR2 can be taken as right angle] Also, CR2 = CO = R and CP = R + h From Equation (1) (R + h)2 = R2 + (h2 + d2) R2 + h2 + 2Rh = R2 + h2 + d2 or d = 2Rh−−−−√ It is clear from this equation that if h is large, d will be large. This explains as to why the television broadcasts are made from tall antennas.

Jin Kazama 8 years, 1 month ago

2(pie)rh
  • 3 answers

Abhay Vashishtha 8 years, 1 month ago

If a beam of plane polarised light falls on analyser then intensity of transmitted light through analyser is directly proportional to square of cosine of angle between transmission axes of polariser and analyser

Rochie Joshi 8 years, 1 month ago

It.

Rochie Joshi 8 years, 1 month ago

When a polarized light from a polarizr is incident on an analyser the intensity of light varies drctly proportional to the square of cosine of angle made by ir.
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

V= -βac RL/Ri. Negative sign shows that the output voltage is 180° out of phase with the input voltage.
  • 5 answers

Ishu Chouhan 8 years, 1 month ago

Vaise sab padna hoga

Ishu Chouhan 8 years, 1 month ago

But mainly focus on this topicd

Ishu Chouhan 8 years, 1 month ago

Cause to sab padna padega

Ishu Chouhan 8 years, 1 month ago

Derive Mirror formula , absolute refractive index, real and apparent depth, lateral dis. And its expression, TIR, refraction through convex refracting surface in rarer medium, lens maker formula bi convex lens derivation and for convex lens(real image),prism ,angle of minimum deviation with conditions and expression , cause of dispersion, scattering of light,telescope ,optical instrument

Akash Chakraborty 8 years, 1 month ago

Prism....lens
  • 3 answers

Shaurya Singh 8 years, 1 month ago

Repeater is the combination of transmitter,receiver,and amplifier.It amplifies a signal and then retransmit it to the receiving end. It is usually done to strengthen the weak signals upto long distances.

Nirmal Soni 8 years, 1 month ago

It is a device which picks up signal from transmitter , amplifies is or retransmit it to receiver or we can say that it is a device which is used to extend the range of communication

Rochie Joshi 8 years, 1 month ago

Repeater is an anteena that recives the signal by transmitter and the send it to the other. Moreover it is used for long distances.
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

Linear momentum is a vector quantity defined as the product of an object’s mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “momentum”.
  • 1 answers

Kalindi Yadav 8 years, 1 month ago

If a body is capable of rotating about an axis, then force applied properly on this body will rotate it about the axis (axis of rotating). This turning effect of the force about the axis of rotation is called torque. Moment of inertia is the property of an object by virtue of which it opposes any change in its state of rotation about an axis.
  • 1 answers

Alia Khan 8 years, 1 month ago

Let qo is individual charge Then F=K(( q1/(ro1)2 + q2/( ro2)2+............ n ))

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